SCS GEARBOX, INC.
739 W. MAIN ST.,BELLEVUE, OHIO 44811
PH: 419-483-7278 FAX: 419-483-4741
PLEASE READ THESE INSTRUCTIONSBEFORE INSTALLING YOUR TRANSFER CASE
Your new transfer case is marked just above the rear output shaft with the gear ratio of the bull set of gears. This is how you can identify oil capacity and gear ratio for your transfer case.
- Yokes for transfer case must be longer than the Snap Ring to
the end of shaft. Minimum length for the yoke spline is 2 3/16”.
Dana/Spicer part numbers for 1 3/4-10 pinion yoke are
#3-4-1841-1 is 1410 series
#3-4-3571-1 is 1480 series
#3-4-3121-1 is Heavy Duty 1480 series
Contact SCS or your dealer for the Companion Flange for 2 1/2 ton Bolt on U-Joint Drivelines.
Caution:
Having your driveshaft too long or if your slip yoke bottoms outwill cause the transfer case housing to break.
- Installation of Yokes or Companion Flanges:
Do not over tighten against snap ring!! Snap ring will pop off. Use Red lock tight on bolt threads and tighten till you crush lock washer and bolt is snug.
- Lubrication Main Case:
Use 80/90 weight synthetic gear lube. Gear lube should be added by removing Q/C cover.
Oil capacity
1 to 1 & 1.64 Bull Gear transfer case use 2 Quarts of oil
2.42 & 2.82 Bull Gear transfer case use 1 1/2 Quarts of oil.
Caution: If the Transfer case is mounted at a severe angle, capacity stays the same and you may have to find a different way to fill the case and disconnect.
- Two Wheel Drive Disconnect
If your transfer case is equipped with a two wheel drive disconnect, then you must add oil to thedisconnect separately. The oil capacity should be filled to the plug marked oil level on the side of the case.
- Operation of Two Wheel Drive Disconnect
When shifting the Two Wheel Dive Disconnect, the Truck must be stopped. Do not grind the Two Wheel Drive Disconnect asit will severely damage the Shaft and Shift collar. When using anin the Cab shifter be sure to mark shifter when fully engaged in 4 wheel drive. The Two Wheel Drive Disconnect must be fully engaged in 4 wheel drive or it will come out of 4 wheel drive and damage the shaft and shift collar.
- Vent
Pipe plug marked at the top of the Q/C lid marked vent needs a pig tail or similar style vent to allow the transfer case to breathe. The vent needs to allow for air flow in and out but keep oil in and dirt out.
- Installing Q/C Gears
Q/C gears are marked by ratio stamped in the gear which needs to face out when installed. The Q/C gear sets are pairs of gears not to be mixed and matched. The Q/C change ratios can be put in overdrive or underdrive (Fig. 1). The Q/C ratios that can be put in overdrive are from 1.032 to 1.286.
- 18” Counter Rotation Box
You must add oil separately to the extension box. The oil level is marked on case. Remove the plug and fill to that level. There is also a vent that needs to be added to the extension box. It is stamped vent on box. It can be added the same way you have vented the main case.
- 23.333” Same Rotation Box
You must add oil separately to the extension box. The oil level is marked on case. Remove the plug and fill to that level. There is also a vent that needs to be added to the extension box. It is stamped vent on box. It can be added the same way you have vented the main case.